Preparing method for magnesium alloy surface composite coating
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A surface composite and composite coating technology, which is applied to the surface coating liquid device, coating, pretreatment surface, etc., can solve the problems of hydrogen gas generation, high porosity, and insufficient structure, so as to slow down corrosion Speed, the effect of improving corrosion resistance
Inactive Publication Date: 2017-05-31
SOUTHEAST UNIV
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Problems solved by technology
In the currently reported technical solutions, such as directly coating the surface of the magnesium alloy with a polylactic acid PLA organic coating, and using an electrodeposition method to prepare a magnesium hydroxide coating on the surface of the magnesium alloy, the corrosion resistance of the magnesium alloy has been improved to a certain extent. Corrosion resistance, but there are many common problems, such as: prone to micropores and cracking, high porosity, self-sealing pores, insufficient structure, hydrogen gas generated by the reaction of hydrolyzed products and magnesium alloy substrates, etc.
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Embodiment 1
[0021] The present example magnesium alloy surface composite coating preparation method comprises the following processes:
[0022] (1) Pre-processing, the steps are as follows:
[0023] The material of the test piece used in this example is AZ31 magnesium alloy, wherein the content of magnesium is as high as 95%. The composition of the main elements of the specimen is shown in Table 1.
[0024] Al Zn mn Si Cu Ni Fe Mg 3.1 0.8 0.15 0.06 0.03 0.02 0.01 margin
[0025] Table 1 Nominal composition (mass fraction)% of main elements of AZ31 magnesium alloy
[0026] In this embodiment, the AZ31 magnesium alloy of 60 mm × 14 mm × 2 mm is selected, and it is polished with 240, 400, 600, 800, and 1500 mesh sandpaper in turn, and after polishing, the surface of the magnesium alloy is polished with a PG2A metallographic sample polishing machine , polished until the surface of the magnesium alloy presents a mirror surface without scratches. Then ...
Embodiment 2
[0044] The present example magnesium alloy surface composite coating preparation method comprises the following processes:
[0045] (1) Pre-processing, the steps are as follows:
[0046] The test piece material used in this example is AZ31 magnesium alloy, same as embodiment 1;
[0047] In this embodiment, the AZ31 magnesium alloy of 60 mm × 14 mm × 2 mm is selected, and it is polished with 240, 400, 600, 800, and 1500 mesh sandpaper in turn, and after polishing, the surface of the magnesium alloy is polished with a PG2A metallographic sample polishing machine , polished until the surface of the magnesium alloy presents a mirror surface without scratches. Then the surface of the magnesium alloy is alkaline washed and dried to remove grease and polishing compounds.
[0048] (2) adopt cathodic electrodeposition method to deposit magnesium hydroxide coating on the surface:
[0049] In this embodiment, the experimental power supply is WYK-300 type DC power supply (produced by Y...
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Abstract
The invention discloses a magnesium alloy material surface modification method, and particularly relates to a preparing method for a magnesium alloy surface composite coating. The method comprises the following steps that firstly, pretreatment is conducted, a magnesium alloy sample is ground, polished, subjected to alkali washing and dried; secondly, a magnesium hydrate coating is deposited on the surface through a cathodic electro-deposition method; and thirdly, an organic coating is applied, and a polylactic acid coating is formed on the surface of the sample subjected to electro-deposition treatment. In the method, the magnesium hydrate coating and PLA are subjected to the reaction, hydrogen is not generated, and the problem about releasing of hydrogen generated when the PLA is directly applied to the surface of the magnesium alloy is ingeniously solved; and the defects that micro holes are likely to occur to the electro-deposition magnesium hydrate coating, the porosity is high, and the structure is not dense enough are overcome through a self-seal hole structure formed by the magnesium hydrate coating and the PLA. The magnesium hydrate plays a neutralization role for the problems that degradation of the PLA in the human body is in an acid state, the liquid pH value is changed, and healing of the wound is not facilitated.
Description
technical field [0001] The invention provides a method for preparing a magnesium alloy surface composite coating, and relates to the technical field of magnesium alloy surface modification. Background technique [0002] Magnesium and its alloys have good biocompatibility, their density and Young's modulus are closest to those of human bones, and their degradation products are non-toxic to the human body and can be excreted through body fluids. Due to the advantages of magnesium and its alloys, the medical community recognizes magnesium and its alloys as revolutionary biomedical metal materials. However, its rapid degradation rate in body fluids does not match the surrounding new tissue and healing rate, which limits its application in biomedicine. Therefore, reducing the corrosion rate of magnesium and its alloys has become the key to research this year, and it is also a hot topic of research by scholars at home and abroad. [0003] The methods to reduce the corrosion rate...
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